You have decided to create your own group in order to offer your services through it - this is a great start to a business, and besides, it is completely free!
To begin with, from your main page, send out invitations to the group to all your friends - of course, not everyone will accept it, but probably most of them (these are kind of not fake friends, but real ones). Excellent! The first step has been taken! You already have some of your friends in the group! Ask these people to invite their friends to the group or share the link to the group on your wall.
Register another page of yours (let's call it professional) - be careful here - fake pages are very quickly exposed and blocked. Therefore, create your real page, where there will be the maximum amount of information about you as a professional in your field, fill it with photographs, examples of work, etc. It should be not just a fake page to attract new people, but your real second page (just the first one is for personal purposes, and the second one is professional).
Add new people to your friends every day from this page. In the page status, write who you are and what you offer. People should understand that this is a living person, interesting and useful for them. Invite people from your target audience (for example, if you are engaged in sewing children's clothes, then your target audience is young mothers).
Be prepared that you will still be asked the question "we know each other", etc. Answer it kindly, clearly, correctly, in order to immediately win over a doubting "friend" to yourself. Then invite friends from this page to the group (you can invite no more than 40 friends per day). So gradually you will promote your group in "VK" in an honest way, there will be people who can really become your customers, who are interested and relevant. This is a slow but sure path to your business.